Lisa Marie Presley Cancels Tour -- My Spine Is Holding Me Back

Lisa Marie Presley has BACKED out of her remaining concert dates ... literally.

Presley has a bum back that has dogged her with chronic pain ... and she just can't stand it anymore ... because doing concerts is now excruciating.

It's not made up. We're told Lisa's doctor ordered her to pull the plug because he fears her condition will worsen with the strain of gyrating on stage -- just like her daddy did.

We're told her back problem has been aggravated by non-stop touring since June, 2012. She says she'll reschedule the cancelled concerts for sometime next year.